SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492015-03-31T14:52:51-06:00SparkFun ElectronicsEmerald on COM-09590 - LED - Basic Red 5mmEmeraldurn:uuid:5b61355c-934e-afb5-fe6b-47ce6319722f2014-05-30T07:12:11-06:00<p>2.2 volts is the minimum voltage drop across the diode for it to light up. So, 24 VDC satisfies that requirement next you need to make sure the current through the diode does not exceed the max 20mA rating listed, recommends designing for 16-18mA current. Let&rsquo;s say 16mA for ease of calculation. With a series circuit of power supply, LED and a resistor you get Vres = 24 - 2.2 = 21.8 V. Then simply, R = V/I = 21.8 / 16e-3 =~ 1.3kOhm.</p>Toni_K on COM-09590 - LED - Basic Red 5mmToni_Kurn:uuid:5abc76ab-65a5-fd16-e154-6f2097d227ef2014-04-08T09:09:26-06:00<p>These are the LEDs we use in our Inventor&rsquo;s Kit with the Arduino Uno and the Redboard. We do run these off of a 5V line, but always with current limiting resistors in circuit. You shouldn&rsquo;t have any issue with that.</p>Customer #543131 on COM-09590 - LED - Basic Red 5mmCustomer #543131urn:uuid:0a28bec0-fc04-1d62-0cd1-a3d9eb84b4a82014-04-07T21:43:13-06:00<p>Does this mean that you can&rsquo;t apply more than 2.2 V across the LED terminals without running into trouble?</p>Toni_K on COM-09590 - LED - Basic Red 5mmToni_Kurn:uuid:4a38c84f-5f4a-5c27-dcd6-85840418fd782012-06-26T13:51:32-06:00<p>The max forward voltage for this LED is 2.2v. Take a look at the datasheet for more information about the max ratings for this.</p>tuttipazzixpizzi on COM-09590 - LED - Basic Red 5mmtuttipazzixpizziurn:uuid:535c8e6d-5040-c6a1-7f91-3b5ec1ec02c82012-06-06T11:05:17-06:00<p>I&rsquo;ve a question: can a led like this work at 24v with a resistor?</p>RaymondBotha on COM-09590 - LED - Basic Red 5mmRaymondBothaurn:uuid:8f96a060-c585-fc4b-b6ea-5614da5fe0762010-02-20T10:52:24-07:00<p>When will this be in stock?</p>